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Cellular Signaling Flashcards

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60873586644 types of cell signaling strategiesendocrine, paracrine, neuronal, contact-dependent0
6087362918endocrine signalinglong range, uses hormones1
6087365480paracrine signalinglocal, secreted proteins2
6087371850neuronal signalinglong or short range depending on the length of the neuron, electrical signals cause secretion of neurotransmitters3
6087378891contact-dependentshort range, membrane bound signaling proteins/glycoproteins4
60873868783 key events during cell signalingreception, transduction, response5
6087397622intracellular receptorsinside the cell, interact with molecules that can cross cell membrane on their own, undergo conformational changes upon binding6
6087400109cell-surface receptorsinteract with molecules that do not cross the cell membrane on their own7
6087435611steroid hormone signaling1) steroid molecules diffuse through cell membrane 2) bind to nuclear hormone receptors (NHRs) to form dimer 3) transported into the nucleus 4) acts as activator and leads to transcription ENDOCRINE8
6087449450nuclear hormone receptors (NHRs)have ligand binding domain (LBD) and DNA binding domain (DBD), transcription factor9
6087463233nuclear translocationmolecule transported into the nucleus10
6087477697guanylyl cyclase (GC)enzyme that nitric oxide binds to, activation results in GTP being converted into cyclic GDP, rapid relaxation of smooth muscle (dilation of blood vessels) PARACRINE11
6087541387viagraphosphodiesterase inhibitor, in order for it to act fast it acts directly on protein (add to this)12
60875684883 basic classes of cell-surface receptors1) ion-channel-coupled receptors 2) G-protein-coupled receptors 3) enzyme-coupled receptors13
6087584675ion-channel-coupled receptorsligand causes channels to open, ions rush in and effect cell changes14
6087601625G-protein-coupled receptorsligand binding to receptor causes conformational change that activates "G-protein" - a protein that binds GTP and can activate/repress enzymes15
6087601626enzyme-coupled receptorsligand binding causes a conformational change that activates intracellular enzyme16
6087599223ligandsignaling molecule17
6087665126GPCRs & G-proteincell-surface receptors, most drugs target them, G-proteins inactive but exchange GDP for GTP when they interact with ligand-bound receptors (GPCRs), G-protein alpha and beta-gamma subunits dissociate and activate enzymes or target proteins18
6087724720adrenaline1) GPCR activated 2) adenylyl cyclase (AC) activated and converts ATP to cAMP (cyclic AMP) 3) cAMP activated PKA (kinase) 4) phosphorylation cascade 5) glycogen breakdown19
6087811279epipen1) epinephrine binds the G-PCR 2) activation of the G-protein 3) activation of adenylyl cyclase 4) second message, cAMP 5) phosphorylation cascade 5) causes smooth muscle cells to relax20
6087843342cAMP/PKA gene expressioncan change gene expression, PKA can phosphorylate and activate transcription factors that active or repress genes21
6087907844Phospholipase C (PPC)can be activated by GPCRs, cleaves a particular type of phospholipid into IP3 and DAG, results in first cellular division22
6087920994IP3opens Ca2+ channels in ER23
6087925984DAGco-factor with Ca2+ for PKC which phosphorylates target proteins24
6088086740receptor tyrosine kinases (RTKs)enzyme-coupled receptors, ligand binding to receptors activates kinase activity in the receptor (auto-phosphorylation of the dimer receptor), active receptor can interact with a GTP-binding protein/G-protein called Ras25
6088107640RasG-protein, activates a protein kinase cascade that leads to cell growth/division26
6088117470MAP kinasemitogen activated protein kinase27
6088212528acytylcholine effects on different cells(A) heart muscle --> decreased rate and force of contraction (B) salivary gland --> secreation (C) skeletal muscle --> contraction28
6088235088notch signaling pathwaydelta/serate/LAG-2 family ligands (DSL) on one cell binds delta receptor (Notch) and cleaves tail, cleaved tail migrates to nucleus, results in transcription of notch-responsive genes CONTACT DEPENDENT29
6088235089presenilincleaves the Notch intracellular domain upon ligand binding30
6088332640dopamine receptorneuronal signaling pathway that produces pleasure feeling, receptor is a GPCR called DRD2, reduces cAMP production and activate phosphorylation31

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